<template>
    <div>
        <div class="shopcart">
            <div class="content">
                <div class="content-left" @click="toggleShow">
                    <div class="logo-wrapper">
                        <div class="logo" :class="{highlight: totalCount}">
                            <i class="iconfont icongouwuche" :class="{highlight: totalCount}"></i>
                        </div>
                        <div class="num" v-if="totalCount">{{ totalCount }}</div>
                    </div>
                    <div class="price" :class="{highlight: totalCount}">￥{{totalPrice}}</div>
                    <div class="desc">另需配送费￥{{ info.deliveryPrice }} 元</div>
                </div>
                <div class="content-right">
                    <div class="pay" :class="payClass">
                        {{ payText }}
                    </div>
                </div>
            </div>
            <transition name="move">
                <div class="shopcart-list" v-show="listShow">
                    <div class="list-header">
                        <h1 class="title">购物车</h1>
                        <span class="empty" @click="clearCart">清空</span>
                    </div>
                    <div class="list-content">
                        <ul>
                            <li class="food" v-for="(food, index) of cartFoods" :key="index">
                                <span class="name">{{ food.name }}</span>
                                <div class="price"><span>￥{{food.price}}</span></div>
                                <div class="cartcontrol-wrapper">
                                    <CartControl :food="food"></CartControl>
                                </div>
                            </li>
                        </ul>
                    </div>
                </div>
            </transition>
        </div>
        <div class="list-mask" @click="toggleShow" v-show="listShow"></div>
    </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapState, mapGetters } from 'vuex'
import { MessageBox } from 'mint-ui'
import CartControl from '../CartControl/CartControl.vue'

export default {
  name: 'ShopCart',
  data () {
    return {
      isShow: false
    }
  },
  components: {
    CartControl
  },
  computed: {
    ...mapState(['cartFoods', 'info']),
    ...mapGetters(['totalCount', 'totalPrice']),
    payClass () {
      const { totalPrice } = this
      const { minPrice } = this.info
      return totalPrice > minPrice ? 'enough' : 'not-enough'
    },
    payText () {
      const { totalPrice } = this
      const { minPrice } = this.info
      if (totalPrice === 0) {
        return `￥${minPrice}元起送`
      } else if (totalPrice < minPrice) {
        return `还差￥${minPrice - totalPrice}元起送`
      } else {
        return '结算'
      }
    },
    listShow () {
      // 如果总数量为 0，直接不显示
      if (this.totalCount === 0) {
        this.isShow = false
        return false
      }

      if (this.isShow) {
        this.$nextTick(() => {
          // 实现BScroll的实例是一个单例
          if (!this.scroll) {
            this.scroll = new BScroll('.list-content', {
              click: true
            })
          } else {
            this.scroll.refresh()  // 让滚动条刷新一下，重新计算内容的高度
          }
          
        })
      }
      return this.isShow
    }
  },
  methods: {
    toggleShow () {
      // 只有总数量大于 0 时，才显示
      if (this.totalCount > 0) {
        this.isShow = !this.isShow
      }
    },
    clearCart () {
      MessageBox.confirm('确定清空购物车吗？').then(action => {
        this.$store.dispatch('clearCart')
      }, () => {})
    }
  }
}
</script>

<style lang="stylus" scoped>
    @import "../../common/stylus/mixins.styl"

    .shopcart
        position fixed
        left 0
        bottom 0
        z-index 50
        width 100%
        height 48px
        .content
            display flex
            background #141d27
            font-size 0
            color rgba(255, 255, 255, 0.4)
            .content-left
                flex 1
                .logo-wrapper
                    display inline-block
                    vertical-align top
                    position relative
                    top -10px
                    margin 0 12px
                    padding 6px
                    width 56px
                    height 56px
                    box-sizing border-box
                    border-radius 50%
                    background #141d27
                    .logo
                        width 100%
                        height 100%
                        border-radius 50%
                        text-align center
                        background #2b343c
                        &.highlight
                            background $green
                        .icongouwuche
                            line-height 44px
                            font-size 24px
                            color #80858a
                            &.highlight
                                color #fff
                    .num
                        position absolute
                        top 0
                        right 0
                        width 24px
                        height 16px
                        line-height 16px
                        text-align center
                        border-radius 16px
                        font-size 9px
                        font-weight 700
                        color #ffffff
                        background rgb(240, 20, 20)
                        box-shadow 0 4px 8px 0 rgba(0, 0, 0, 0.4)
                .price
                    display inline-block
                    vertical-align top
                    margin-top 5px
                    line-height 24px
                    padding-right 12px
                    box-sizing border-box
                    font-size 16px
                    font-weight 700
                    color #fff
                    &.highlight
                        color #fff
                .desc
                    display inline-block
                    vertical-align bottom
                    margin-bottom 15px
                    margin-left -45px
                    font-size 10px
            .content-right
                flex 0 0 105px
                width 105px
                .pay
                    height 48px
                    line-height 48px
                    text-align center
                    font-size 12px
                    font-weight 700
                    color #fff
                    &.not-enough
                        background #2b333b
                    &.enough
                        background #00b43c
                        color #fff
        .ball-container
            .ball
                position fixed
                left 32px
                bottom 22px
                z-index 200
                transition all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
                .inner
                    width 16px
                    height 16px
                    border-radius 50%
                    background $green
                    transition all 0.4s linear
        .shopcart-list
            position absolute
            left 0
            top 0
            z-index -1
            width 100%
            transform translateY(-100%)
            &.move-enter-active, &.move-leave-active
                transition transform .3s
            &.move-enter, &.move-leave-to
                transform translateY(0)
            .list-header
                height 40px
                line-height 40px
                padding 0 18px
                background #f3f5f7
                border-bottom 1px solid rgba(7, 17, 27, 0.1)
                .title
                    float left
                    font-size 14px
                    color rgb(7, 17, 27)
                .empty
                    float right
                    font-size 12px
                    color rgb(0, 160, 220)

            .list-content
                padding 0 18px
                max-height 217px
                overflow hidden
                background #fff
                .food
                    position relative
                    padding 12px 0
                    box-sizing border-box
                    bottom-border-1px(rgba(7, 17, 27, 0.1))
                    .name
                        line-height 24px
                        font-size 14px
                        color rgb(7, 17, 27)
                    .price
                        position absolute
                        right 90px
                        bottom 12px
                        line-height 24px
                        font-size 14px
                        font-weight 700
                        color rgb(240, 20, 20)
                    .cartcontrol-wrapper
                        position absolute
                        right 0
                        bottom 6px

    .list-mask
        position fixed
        top 0
        left 0
        width 100%
        height 100%
        z-index 40
        backdrop-filter blur(10px)
        opacity 1
        background rgba(7, 17, 27, 0.6)
        &.fade-enter-active, &.fade-leave-active
            transition all 0.5s
        &.fade-enter, &.fade-leave-to
            opacity 0
            background rgba(7, 17, 27, 0)
</style>
